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Civil Engineering

critical slenderness ratio if there is an additional lateral support in the weak direction at mid-height.

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter4: Compression Members

Section: Chapter Questions

Problem 4.7.3P

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Concept explainers

Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur, chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.

Question

A W12x79 of A573 Grade 60 (Fy = 415 MPa) steel is used as a compression member. It is 8 m long, pinned at the top fixed at bottom. The properties are as follows: Ag = 14,968 sq.mm. rx= 133.65 mm, Ty = 77.47 mm

Calculate the critical slenderness ratio if there is an additional lateral support in the weak direction at mid-height.

If the columns sustains a service axial live load of 990 kN calculate the safe service axial dead load in kN by URFD.

Calculate the allowable axial strength (kN) by ASD

Calculate the design axial strength (kN) of the colurn by LRFD.

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